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I actually figured it out, the trans fluid was dark but not black or burned... what happened was what I thought, some very fine metal shavings (became the consistency of sludge) were collecting on the bottom of the pan on the magnet, when the fluid heated up the metal circulated and clogged the...

Hi everyone, I've done my best to search around the forum for an answer to this, but I'm afraid I wasn't able to find one. I've got a 99 Yukon with a 5.7 and the 4L60E, my issue is this: the transmission functions perfectly when cold, but when it warms up it completely ceases to function...